Configuration of Virtual Local Area Network (VLANs)

Virtual Local Area Network (VLAN)

Virtual Local Area Network (VLAN) is broadcast domain that is used to isolate a network at layer 2 (Data Link Layer) of OSI model. Virtual Local Area Network (VLAN) is used to divide major network into sub networks to increase the performance of network.

All the interfaces of network devices are assigned to vlan 1 by default. To assign interfaces to newly created vlans following commands are used.

Configurations

Switch>enable

Switch#configure terminal

Switch(config)#hostname TestSwitch

TestSwitch(config)#enable password cisco (Plain Text Password)

TestSwitch(config)#enable secret class (Encrypted Password)

TestSwitch(config)#username TestSwitch secret cisco

TestSwitch(config)#ip domain-name cisco.com

TestSwitch(config)#crypto key generate rsa

(Set key between 360 - 2048)

TestSwitch(config)#line console 0

TestSwitch(config-line)#password cisco

TestSwitch(config-line)#login

TestSwitch(config-line)#exit

TestSwitch(config)#line vty 0 15

TestSwitch(config-line)#transport input ssh

TestSwitch(config-line)#login local

TestSwitch(config-line)#exit

TestSwitch(config)#interface vlan 1

TestSwitch(config-if)#ip address 192.168.1.254 255.255.255.0

TestSwitch(config-if)#no shutdown

TestSwitch(config-if)#exit

!Creating VLANs

TestSwitch(config)#vlan 2

TestSwitch(config-vlan)#name Admin

TestSwitch(config-vlan)#exit

TestSwitch(config)#vlan 3

TestSwitch(config-vlan)#name Management

TestSwitch(config-vlan)#exit

!Assigning ports to VLANs

TestSwitch(config)#interface range fastEthernet 0/9-16

TestSwitch(config-if-range)#switchport mode access

TestSwitch(config-if-range)#switchport access vlan 2

TestSwitch(config-if-range)#exit

TestSwitch(config)#interface range fastEthernet 0/17-24

TestSwitch(config-if-range)#switchport mode access

TestSwitch(config-if-range)#switchport access vlan 3

TestSwitch(config-if-range)#exit

TestSwitch(config)#exit

TestSwitch#copy running-config startup-config

Result

To check the assigned ports to VLANs apply the following command

TestSwitch#show vlan brief